Display panel and display device comprising cascaded shift registers

ABSTRACT

Provided are a display panel and a display device. The display panel includes a driver circuit including N stages of cascaded shift registers, where N≥2. Each shift register includes a first control part and a second control part. The second control part includes a first control unit and a second control unit. The first control unit is configured to receive a signal of a preset node and a first output control signal and control a signal of a fourth node, where the preset node is one of a second node or a third node. A first output control signal received by a shift register at an M 1 -th stage is a signal of the preset node of a shift register at an M 2 -th stage, where 1≤M 1 ≤N, 1≤M 2 ≤N, 1≤|M 1 −M 2 |≤i, and 2≤i≤N−1.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No.202110519069.5 filed May 12, 2021, the disclosure of which isincorporated herein by reference in its entirety.

FIELD

Embodiments of the present disclosure relate to the field of displaytechnologies and, in particular, to a display panel and a displaydevice.

BACKGROUND

With the continuous development of display technologies, various displaypanels such as an organic light-emitting display panel and a liquidcrystal display panel are widely used in electronic devices with displayfunctions, bringing great convenience to people's daily life and work.

The display panel generally includes a driver circuit. The drivercircuit is configured to output a drive signal, and the drive signal istransmitted to a pixel circuit in a pixel array by using a gate scanningline and other signal lines, so that the pixel array is controlled todisplay an image. It has become a current research focus to provide adriver circuit with a simple structure and stable output.

SUMMARY

The present disclosure provides a display panel to provide a drivercircuit with a simple structure and stable output.

In a first aspect, embodiments of the present disclosure provide adisplay panel. The display panel includes a driver circuit including Nstages of cascaded shift registers, where N≥2.

Each shift register includes a first control part and a second controlpart.

The first control part is configured to receive at least an input signaland control a signal of a first node and a signal of a second node inresponse to at least a first clock signal, and the first control part isconfigured to receive a second voltage signal and a first voltage signaland control a signal of a third node in response to a signal of thefirst node and a signal of the second node, where the first voltagesignal is a low level signal, and the second voltage signal is a highlevel signal.

The second control part includes a first control unit and a secondcontrol unit.

The first control unit is configured to receive a signal of a presetnode and a first output control signal and control a signal of a fourthnode, where the preset node is one of the second node or the third node.

The second control unit is configured to receive the first voltagesignal and generate an output signal in response to a signal of thefourth node, or the second control unit is configured to receive afourth voltage signal and generate an output signal in response to asignal of a fifth node, where the fifth node is connected to one of thesecond node or the third node that is not the preset node, the thirdvoltage signal is a low level signal, and the fourth voltage signal is ahigh level signal.

A first output control signal received by a shift register at an M1-thstage is a signal of a preset node of a shift register at an M2-thstage, where 1≤M1≤N, 1≤M2≤N, 1≤|M1−M2|≤i, and 2≤i≤N−1.

In a second aspect, embodiments of the present disclosure furtherprovide a display device. The display device includes the display paneldescribed in any of embodiments of the present disclosure.

In the display panel provided in embodiments of the present disclosure,a driver circuit includes a first control part and a second controlpart; the second control part includes a first control unit and a secondcontrol unit, where the first control unit is configured to control asignal of a fourth node according to a signal of a preset node and afirst output control signal, and the second control unit is configuredto output a first voltage signal according to a signal of the fourthnode or is configured to output a fourth voltage signal according to asignal of a fifth node, where the first voltage signal and the fourthvoltage signal form an output signal of the shift register. In thismanner, the urgent need for a driver circuit with a simple structure andstable output in the related art can be solved, and the effect ofproviding a driver circuit with a simple structure and a stable outputsignal can be achieved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a structure diagram of a display panel according to anembodiment of the present disclosure;

FIG. 2 is a structure diagram of a driver circuit according to anembodiment of the present disclosure;

FIG. 3 is a structure diagram of another driver circuit according to anembodiment of the present disclosure;

FIG. 4 is a structure diagram of a shift register according to anembodiment of the present disclosure;

FIG. 5 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 6 is a structure diagram of a first control part according to anembodiment of the present disclosure;

FIG. 7 is a structure diagram of another first control part according toan embodiment of the present disclosure;

FIG. 8 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 9 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 10 is a structure diagram of a shift register according to anembodiment of the present disclosure;

FIG. 11 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 12 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 13 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 14 is a structure diagram of a shift register according to anembodiment of the present disclosure;

FIG. 15 is a structure diagram of another shift register according to anembodiment of the present disclosure;

FIG. 16 is a circuit element diagram of a shift register according to anembodiment of the present disclosure;

FIG. 17 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 18 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 19 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 20 is a timing sequence diagram of a shift register according to anembodiment of the present disclosure;

FIG. 21 is a timing sequence diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 22 is a circuit element diagram of a shift register according to anembodiment of the present disclosure;

FIG. 23 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 24 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 25 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 26 is a timing sequence diagram of another shift register accordingto an embodiment of the present disclosure;

FIG. 27 is a timing sequence diagram of another shift register accordingto an embodiment of the present disclosure; and

FIG. 28 is a structure diagram of a display device according to anembodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure is further described hereinafter in detail inconjunction with drawings and embodiments. It is to be understood thatembodiments described hereinafter are intended to explain the presentdisclosure and not to limit the present disclosure. Additionally, it isto be noted that for ease of description, only part, not all, ofstructures related to the present disclosure are illustrated in thedrawings.

In view of the problem mentioned in BACKGROUND, embodiments of thepresent disclosure provide a display panel and a display device. Thedisplay panel includes a driver circuit. The driver circuit includes Nstages of cascaded shift registers, where N≥2. The shift registerincludes a first control part and a second control part. The firstcontrol part receives at least an input signal and controls a signal ofa first node and a signal of a second node in response to at least afirst clock signal, and the first control part receives a first voltagesignal and a second voltage signal and controls a signal of a third nodein response to a signal of the first node and a signal of the secondnode, where the first voltage signal is a low level signal, and thesecond voltage signal is a high level signal. The second control partincludes a first control unit and a second control unit. The firstcontrol unit is configured to receive a signal of a preset node and afirst output control signal and control a signal of a fourth node, wherethe preset node is one of the second node or the third node. The secondcontrol unit is configured to receive a third voltage signal andgenerate an output signal in response to a signal of the fourth node, orthe second control unit is configured to receive a fourth voltage signaland generate an output signal in response to a signal of a fifth node,where the fifth node is connected to one of the second node or the thirdnode that is not the preset node, the third voltage signal is a lowlevel signal, and the fourth voltage signal is a high level signal. Afirst output control signal received by a shift register at an M1-thstage is a signal of a present node of a shifter register at an M2-thstage, where 1≤M1≤N, 1≤M2≤N, 1≤|M1−M2|≤i, and 2≤i≤N−1. By adopting thepreceding embodiments, a driver circuit with a simple structure andstable output can be obtained.

In embodiments of the present disclosure are described clearly andcompletely below in conjunction with the drawings in embodiments of thepresent disclosure. Apparently, the embodiments described below arepart, not all, of embodiments of the present disclosure.

FIG. 1 is a structure diagram of a display panel according to anembodiment of the present disclosure. FIG. 2 is a structure diagram of adriver circuit according to an embodiment of the present disclosure.FIG. 3 is a structure diagram of another driver circuit according to anembodiment of the present disclosure. FIG. 4 is a structure diagram of ashift register according to an embodiment of the present disclosure.FIG. 5 is a structure diagram of another shift register according to anembodiment of the present disclosure. FIG. 6 is a structure diagram of afirst control part according to an embodiment of the present disclosure.FIG. 7 is a structure diagram of another first control part according toan embodiment of the present disclosure. The structure of the shiftregister in the driver circuit shown in FIG. 2 is different from thestructure of the shift register in the driver circuit shown in FIG. 3 ,the preset node in the shift register shown in FIG. 4 is different fromthe preset node in the shift register shown in FIG. 5 , and thestructure of the first control part shown in FIG. 6 is different fromthe structure of the first control part shown in FIG. 7 . Referring toFIGS. 1 to 7 , the display panel includes a driver circuit 10. Thedriver circuit 10 includes N stages of cascaded shift registers, whereN≥2. The shift register includes a first control part 110 and a secondcontrol part 120. The first control part 110 receives at least an inputsignal IN and controls a signal of a first node N1 and a signal of asecond node N2 in response to at least a first clock signal, and thefirst control part 110 receives a first voltage signal VGL1 and a secondvoltage signal VGH1 and controls a signal of a third node N3 in responseto a signal of the first node N1 and a signal of the second node N2,where the first voltage signal VGL1 is a low level signal, and thesecond voltage signal VGH1 is a high level signal. The second controlpart 120 includes a first control unit 121 and a second control unit122. The first control unit 121 is configured to receive a signal of apreset node NY and a first output control signal CRL and control asignal of a fourth node N4, where the preset node NY is one of thesecond node N2 or the third node N3. The second control unit 122 isconfigured to receive a third voltage signal VGL2 and generate an outputsignal OUT in response to a signal of the fourth node N4, or the secondcontrol unit 122 is configured to receive a fourth voltage signal VGH2and generate an output signal OUT in response to a signal of a fifthnode N5, where the fifth node N5 is connected to one of the second nodeN2 or the third node N3 that is not the preset node NY, where the thirdvoltage signal VGL2 is a low level signal, and the fourth voltage signalVGH2 is a high level signal. A first output control signal CRL receivedby a shift register at an M1-th stage is a signal of a present node NYof a shifter register at an M2-th stage, where 1≤M1≤N, 1≤M2≤N,1≤|M1−M2|≤i, and 2≤i≤N−1.

In an embodiment, the display panel may include a display region AA anda non-display region NA. The display region AA includes multiple pixels30, and each pixel 30 includes a pixel circuit 31 and a light-emittingelement 32. The non-display region NA includes the driver circuit 10,and the driver circuit 10 is electrically connected to the pixel circuit31 through a signal line and provides a driver signal for the pixelcircuit 31 so that the pixel circuit 31 drives the light-emittingelement 32 to emit light, and thus the effect of displaying an image canbe achieved. The non-display region NA may further include a driver chip20, and the drive chip 20 is electrically connected to the drivercircuit 10 through a signal line and provides a signal required for thenormal operation of the driver circuit 10 for the driver circuit 10,such as an input signal IN, a first clock signal, a first output controlsignal CRL, a first voltage signal VGL1, a second voltage signal VGH1, athird voltage signal VGL2, and a fourth voltage signal VGH2.

It is to be noted that FIG. 1 only shows that the driver circuit 10 islocated on the left side of the display region AA by way of example, butit is not limited to this. Some embodiment may set the position of thedriver circuit 10 in the display panel according to actual situations.For example, driver circuits 10 may also be disposed on two oppositesides of the display region AA.

In an embodiment, the driver circuit 10 includes N stages of cascadedshift registers, where N≥2, and the specific value of N may be setaccording to actual situations and is not limited herein. The “cascaded”described herein means that a signal of a certain node of the shiftregister at this stage is used as an input signal IN of the shiftregister at the next stage. For the shift register at the first stage,the input signal IN may be provided by the driver chip 20.

In an embodiment, the specific structure of the first control part 110may be set according to actual situations and is not limited herein, andtypical examples will also be described hereinafter, which will not berepeated herein. Although the specific structure of the first controlpart 110 is various, the first control part 110 in any structure needsat least one input signal IN and at least one first clock signal asshown in FIGS. 6 and 7 . The input signal IN includes a high levelsignal and a low level signal. For example, the input signal IN may beequal to the voltage value of the first voltage signal VGL1 or thevoltage value of the second voltage signal VGH1. The first clock signalalso includes a high level signal and a low level signal. For example,the first clock signal may be equal to the voltage value of the firstvoltage signal VGL1 or the voltage value of the second voltage signalVGH1. The state of the first clock signal at a certain moment (whetherat a high level or a low level) determines the state of the first nodeN1 and the state of the second node N2 at this moment, that is, thelevel change of the first clock signal may cause the level change of thefirst node N1 and the level change of the second node N2. The state ofthe signal of the first node N1 and the state of the signal of thesecond node N2 at a certain moment together determine the state of thesignal of the third node N3 at this moment, that is, the level change ofthe first node N1 and the level change of the second node N2 may causethe level change of the third node N3.

In an embodiment, a drive signal (that is, the output signal OUT) outputby the shift register includes a high level signal (that is, the fourthvoltage signal VGH2) and a low level signal (that is, the third voltagesignal VGL2). The drive signal may be valid when the drive signal is ahigh level signal or may be valid when the drive signal is a low levelsignal, which is not limited herein. When the drive signal is a validlevel signal, a pixel circuit 31 that receives the drive signal startsto operate in response to the valid level signal and drives alight-emitting element 32 to emit light. The first clock signal includesa high level signal pulse and a low level signal pulse.

In an embodiment, the second control part 120 includes a first controlunit 121 and a second control unit 122. The first control unit 121 isconfigured to receive the signal of the preset node NY and the firstoutput control signal CRL and control the signal of the fourth node N4.The preset node NY may be the third node N3; and in this case, thesecond node N2 is electrically connected to the fifth node N5 (as shownin FIG. 4 ). The preset node NY may also be the second node N2; and inthis case, the third node N3 is electrically connected to the fifth nodeN5 (as shown in FIG. 5 ). The second control unit 122 is configured tocontrol the output of the third voltage signal VGL2 in response to thesignal of the fourth node N4, or control the output of the fourthvoltage signal VGH2 in response to the signal of the fifth node N5, andthe third voltage signal VGL2 and the fourth voltage signal VGH2 formthe output signal OUT of the shift register.

The first output control signal CRL received by the shift register atthe M1-th stage may be the signal of the preset node NY of the shiftregister at another stage. In this manner, the driver chip 20 does notneed to output the first output control signal CRL to the shiftregister, and thus a circuit structure for generating the first outputcontrol signal CRL does not need to be provided in the driver chip 20,which is conducive to reducing the cost of the driver chip 20; moreover,a signal line for transmitting the first output control signal CRL doesnot need to be provided on the display panel, which is conducive toreducing the frame and increasing the screen-to-body ratio.

It is to be noted that the value range of the voltage value of the highlevel signal and the value range of the voltage value of the low levelsignal may be set according to actual situations, which are not limitedherein. The first voltage signal and the third voltage signal are bothlow level signals, and the voltage value of the first voltage signal maybe the same as or different from the voltage value of the third voltagesignal, which is not limited herein. The second voltage signal and thefourth voltage signal are both high level signals, and the voltage valueof the second voltage signal may be the same as or different from thevoltage value of the fourth voltage signal, which is not limited herein.In an embodiment, the voltage value of the first voltage signal is lessthan the voltage value of the third voltage signal, and the voltagevalue of the second voltage signal is greater than the voltage value ofthe fourth voltage signal. In this manner, the waveform stability of theoutput signal OUT of the shift register can be improved.

In the display panel provided in embodiments of the present disclosure,a driver circuit 10 includes a first control part 110 and a secondcontrol part 120; and the second control part 120 includes a firstcontrol unit 121 and a second control unit 122, where the first controlunit 121 is configured to control a signal of a fourth node N4 accordingto a signal of a preset node NY and a first output control signal CRL,and the second control unit is configured to output a third voltagesignal VGL2 according to the signal of the fourth node N4 or isconfigured to output a fourth voltage signal VGH2 according to a signalof a fifth node N5, where the third voltage signal VGL2 and the fourthvoltage signal VGH2 form an output signal OUT of the shift register. Inthis manner, the urgent need for the driver circuit 10 with a simplestructure and stable output in the related art can be solved, and theeffect of providing the driver circuit 10 with a simple structure and astable output signal OUT can be achieved.

In an embodiment, during at least part of the time period during whichthe signal of the fourth node N4 is a low level signal, the signal ofthe preset node NY and the first output control signal CRL are both lowlevel signals.

The preset node NY described herein refers to the second node N2 (asshown in FIGS. 5 and 9 ) or the third node N3 (as shown in FIGS. 4 and 8) in the shift register at the same stage as the fourth node N4.

FIG. 8 is a structure diagram of another shift register according to anembodiment of the present disclosure. FIG. 9 is a structure diagram ofanother shift register according to an embodiment of the presentdisclosure. The preset node NY of the shift register shown in FIG. 8 isdifferent from the preset node NY of the shift register shown in FIG. 9. Referring to FIGS. 8 and 9 , in an embodiment, the second control unit122 includes a first sub-control unit 1221 and a second sub-control unit1222. The first sub-control unit 1221 is configured to receive the thirdvoltage signal VGL2 and control the output of the third voltage signalVGL2 in response to the signal of the fourth node N4, and the secondsub-control unit 1222 is configured to receive the second voltage signalVGH1 and control the output of the fourth voltage signal VGH2 inresponse to the signal of the fifth node N5. In an embodiment, when thesignal of the preset node NY is a low level signal, the signal of thefourth node N4 is also a low level signal. In addition, when the signalof the fourth node N4 is a low level signal, the first sub-control unit1221 is turned on, and the third voltage signal VGL2 is output throughthe turned-on first sub-control unit 1221.

It is to be understood that the first sub-control unit 1221 is turned onwhen the signal of the fourth node N4 is a low level signal, and thethird voltage signal VGL2 received by the first sub-control unit 1221 isalso a low level signal, then the output state of the first sub-controlunit 1221 is easily affected. In the present application, during atleast part of the time period during which the signal of the fourth nodeN4 is a low level signal, the first output control signal CRL is a lowlevel signal, so that during the time period during which the signal ofthe fourth node N4 is a low level signal, the first output controlsignal CRL has a transition from a high level signal to a low levelsignal, the signal of the fourth node N4 may transit from a low levelsignal to a low level signal with a lower voltage value, and thedifference between the low voltage signal with a lower voltage value andthe third voltage signal VGL2 is relatively great. In this manner, it isensured that the first sub-control unit 1221 is fully turned on, theoutput state of the first sub-control unit 1221 can be prevented frombeing affected, and the waveform stability of the output signal OUT canbe improved.

In an embodiment, a pulse period of the first clock signal is S1, andthe width of a low level pulse of the output signal OUT is S2, whereS2=a×S1, and i≤2a.

It is to be understood that the pulse period of the first clock signalis S1, and the width of the low level pulse of the output signal OUT isS2, where S2=a×S1, so that after the first clock signal transits for aperiods, the output signal OUT passes through one low level width. Forthe shift register, the first clock signal passes through one pulseperiod, and the output signal OUT is shifted once toward the next stageor is shifted twice toward the next stage and the stage next to the nextstage, that is, a difference between the start time when the shiftregister at this stage outputs a low level signal and the start timewhen the shift register at the next stage outputs a low level signal isS1 which is one pulse period of the first clock signal or S1×1/2 whichis half of the pulse period of the first clock signal. This case will bedescribed in detail later in conjunction with specific circuit timingsequence. During the stage where the output signal OUT of the shiftregister is a low level signal, the preset node NY and the fourth nodeN4 of the shift register at this stage are also low level signals.Therefore, during the stage where the output signal OUT of the shiftregister at the M1-th stage is a low level signal, stages where outputsignals OUT and signals of preset nodes NY of the shift registers fromthe (M1+1)-th stage to the (M1+2a−1)-th stage are low level signals alsoexist. In other words, the low level signal of the output signal OUT ofthe shift register at the M1-th stage and the low level signal of thepreset node NY of the shift registers at any one of the (M1+1)-th stageto the (M1+2a−1)-th stage overlap, and thus the preset node NY of theshift register at any one of the (M1+1)-th stage to the (M1+2a−1)-thstage may be used as the first output control signal CRL of the shiftregister at the M1-th stage.

It is to be noted that the specific value of a may be set according toactual situations and is not limited herein.

In an embodiment, the effective pulse time of the first clock signalreceived by the shift register at the M1-th stage and the effectivepulse time of the first clock signal received by the shift register atthe (M1+1)-th stage do not overlap.

In an embodiment, some first control parts 110 need the first clocksignal to control the signal changes of the first node N1, the secondnode N2, and the third node N3 (as shown in FIG. 6 ). In this case, if afirst clock signal input terminal of the shift register at the M1-thstage is connected to a CK signal, a first clock signal input terminalof the shift register at the (M1+1)-th stage is connected to an XCKsignal. Some first control parts 110 need both the first clock signaland a second clock signal to control the signal changes of the firstnode N1, the second node N2, and the third node N3 (as shown in FIG. 7). In this case, if the first clock signal input terminal of the shiftregister at the M1-th stage is connected to the CK signal, and a secondclock signal input terminal is connected to the XCK signal, then thefirst clock signal input terminal of the shift register at the (M1+1)-thstage is connected to the XCK signal, and a second clock signal inputterminal is connected to the CK signal. The effective pulse time of thefirst clock signal received by the shift register at the M1-th stage andthe effective pulse time of the first clock signal received by the shiftregister at the (M1+1)-th stage do not overlap, so that it can beensured that the pulse signal time of the XCK signal received by thefirst clock signal terminal of the shift register at the (M1+1)-th stageand the pulse signal time of the CK signal received by the first clocksignal terminal of the shift register at the M1-th stage do not overlap,and thus the shift effect of the output signal OUT can be ensured.

In an embodiment, the specific structure of the first control unit 121is various, and typical examples are described hereinafter and do notconstitute a limitation to the present application.

FIG. 10 is a structure diagram of a shift register according to anembodiment of the present disclosure. FIG. 11 is a structure diagram ofanother shift register according to an embodiment of the presentdisclosure. The preset node NY of the shift register shown in FIG. 10 isdifferent from the preset node NY of the shift register shown in FIG. 11. Referring to FIGS. 10 and 11 , in an embodiment, the first controlunit 121 includes a first capacitor C1, where a first electrode plate ofthe first capacitor C1 is configured to receive the first output controlsignal CRL, and a second electrode plate of the first capacitor C1 isconnected to the fourth node N4.

It is to be understood that the first capacitor C1 is connected betweenthe first output control signal CRL and the fourth node N4, and thecontrol of the first output control signal CRL to the fourth node N4 canbe achieved through the coupling effect of the first capacitor C1.During the time period during which the fourth node N4 is at a lowlevel, the first output control signal CRL transits from a high levelsignal to a low level signal at a certain moment, so that the voltagevalue of the low level signal of the fourth node N4 becomes lower. Inthis manner, the difference between the low level signal of the fourthnode N4 and the third voltage signal VGL2 can be increased, to enablethe third voltage signal VGL2 to be output more fully and avoiding thetailing of the output signal OUT.

It is to be noted that the specific value of the capacitance of thefirst capacitor C1 may be set according to actual situations and is notlimited herein.

FIG. 12 is a structure diagram of another shift register according to anembodiment of the present disclosure. FIG. 13 is a structure diagram ofanother shift register according to an embodiment of the presentdisclosure. The preset node NY of the shift register shown in FIG. 12 isdifferent from the preset node NY of the shift register shown in FIG. 13. Referring to FIGS. 12 and 13 , in an embodiment, the first controlunit 121 further includes a first gating unit 1211. One terminal of thefirst gating unit 1211 is connected to the preset node NY, anotherterminal of the first gating unit 1211 is connected to the fourth nodeN4, and a control terminal of the first gating unit 1211 is configuredto receive a fifth voltage signal VGL3. When the signal of the presetnode NY and the first output control signal CRL are both low levelsignals, the fifth voltage signal VGL3 controls the first gating unit1211 to be turned off.

It is to be understood that when the signal of the preset node NY andthe first output control signal CRL are both low level signals, thefirst output control signal CRL acts on the fourth node N4, and the lowlevel signal of the fourth node N4 is pulled down. In this case, thefifth voltage signal VGL3 controls the first gating unit 1211 to beturned off, which can prevent the change of the voltage value of thefourth node N4 from affecting the change of the voltage value of thepreset node NY.

It is also to be understood that when the third node N3 is used as theinput of the shift register at the next stage and the third node N3 isthe preset node NY, the first gating unit 1211 may disconnect the thirdnode N3 and the fourth node N4 when the first output control signal CRLacts on the fourth node N4. In this manner, the change of the voltagevalue of the fourth node N4 is not transmitted to the shift register atthe next stage through the third node N3 so that the output of the shiftregister at the next stage can be prevented from being affected.

With continued reference to FIGS. 12 and 13 , in an embodiment, thefirst gating unit 1211 includes a first transistor M1, where a source ofthe first transistor M1 is connected to the preset node NY, a drain ofthe first transistor M1 is connected to the fourth node N4, and a gateof the first transistor M1 receives the fifth voltage signal VGL3. Whenthe signal of the preset node NY and the first output control signal CRLare both low level signals, the fifth voltage signal VGL3 controls thefirst transistor M1 to be turned off.

It is to be understood that the first gating unit 1211 includes thefirst transistor M1 so that the structure of the first gating unit 1211can be simplified, which is conducive to simplifying the structure ofthe shift register.

With continued reference to FIGS. 12 and 13 , in an embodiment, thefirst transistor M1 is a P-type metal oxide semiconductor (PMOS) typetransistor, the fifth voltage signal VGL3 is a constant low level signalV, and |V|≤|VGL1|+|Vth|, where VGL1 denotes the first voltage signalVGL1, and Vth denotes a threshold voltage of the first transistor M1.

It is to be understood that the fifth voltage signal VGL3 is a constantlow level signal and needs to satisfy: |V|≤|VGL1|+|Vth|. Since when |V|is greater (|V|>|VGL1|+|Vth|), it means that the signal V is lower, thenafter the potential of the fourth node N4 is pulled down by the firstoutput control signal CRL, the first transistor M1 cannot be turned offin this case, and it cannot be ensured that the preset node NY isdisconnected from the fourth node N4. Therefore, V needs to satisfy:|V|≤|VGL1|+|Vth|, so that it is ensured that the first transistor M1 canbe turned off after the first output control signal CRL pulls down thefourth node N4.

In an embodiment, the fifth voltage signal VGL3 and the first voltagesignal VGL1 are the same signal.

It is to be understood that the fifth voltage signal VGL3 and the firstvoltage signal VGL1 are the same signal so that the circuit structureonly for generating the fifth voltage signal VGL3 in the driver chip 20can be omitted, which is conducive to reducing the cost. In addition,the signal line for transmitting the fifth voltage signal VGL3 betweenthe driver chip 20 and the driver circuit 10 can also be omitted, whichis conducive to narrowing the frame.

FIG. 14 is a structure diagram of a shift register according to anembodiment of the present disclosure. FIG. 15 is a structure diagram ofanother shift register according to an embodiment of the presentdisclosure. The preset node NY of the shift register shown in FIG. 14 isdifferent from the preset node NY of the shift register shown in FIG. 15. Referring to FIGS. 14 and 15 , in an embodiment, the first controlunit 121 further includes a second gating unit 1212. One terminal of thesecond gating unit 1212 is connected to the fourth node N4, anotherterminal of the second gating unit 1212 is configured to receive thefirst output control signal CRL, and a control terminal of the secondgating unit 1212 is connected to the preset node NY. When the presetnode NY is a low level signal, the second gating unit 1212 is turned on.

In an embodiment, when the preset node NY is a low level signal, thesecond gating unit 1212 is turned on, and the first output controlsignal CRL may be transmitted to the fourth node N4 through theturned-on second gating unit 1212. After the first output control signalCRL transits from a high level signal to a low level signal, the voltagevalue of the low level signal of the fourth node N4 may be pulled down.In this case, the shift register outputs the third voltage signal VGL2.In addition, since the first output control signal CRL pulls down thesignal of the fourth node N4, the shift register may fully output thesecond voltage signal VGH1, so that tailing can be avoided. When thepreset node NY is a high level signal, the second gating unit 1212 isturned off, and the first output control signal CRL cannot betransmitted to the fourth node N4. In this case, the shift registeroutputs the fourth voltage signal VGH2.

It is to be understood that the second gating unit 1212 is provided sothat it is ensured that only when the preset node NY is a low levelsignal, the first output control signal CRL is connected to the shiftregister at this stage, and the first output control signal CRL is notallowed to affect the potential of the fourth node N4 at other times. Inthis manner, it can be ensured that the circuit is more stable when thepreset node NY is a high level signal.

It is also to be understood that the signal of the preset node NYcontrols the turning on and off of the second gating unit 1212 so thatthe circuit structure only for generating the control signal of thesecond gating unit 1212 in the driver chip 20 can be omitted, which isconducive to further reducing the cost. In addition, the signal line fortransmitting the control signal of the second gating unit 1212 betweenthe driver chip 20 and the driver circuit 10 can also be omitted, whichis conducive to further narrowing the frame.

With continued reference to FIGS. 14 and 15 , in an embodiment, thesecond gating unit 1212 includes a second transistor M2, where a sourceof the second transistor M2 is configured to receive the first outputcontrol signal CRL, a drain of the second transistor M2 is connected tothe fourth node N4, and a gate of the second transistor M2 is connectedto the preset node NY.

In an embodiment, the second transistor M2 is a PMOS type transistor. Inan embodiment, the drain of the second transistor M2 is connected to thefirst electrode plate of the first capacitor C1.

It is to be understood that the second gating unit 1212 includes thesecond transistor M2 so that the structure of the second gating unit canbe simplified, which is conducive to simplifying the structure of theshift register.

In an embodiment, when the preset node NY is the third node N3 and theinput signal IN of the shift register is a low level signal, the outputsignal OUT is a low level signal. In this manner, it can be ensured thatwhen the preset node NY is a low level signal, the output signal OUT isa low level signal.

In an embodiment, when the third node N3 is the preset node NY and theinput signal IN is a low level signal, it can be ensured that when thepreset node NY is a low level signal, the output signal OUT is a lowlevel signal. Hereinafter, a detailed description will be given inconjunction with typical examples of the first control part 110, andrepetition is not made here.

In an embodiment, when the preset node NY is the second node N2 and theinput signal IN of the shift register is a high level signal, the outputsignal OUT is a low level signal. In this manner, it can be ensured thatwhen the preset node NY is a low level signal, the output signal OUT isa low level signal.

In an embodiment, when the second node N2 is the preset node NY and theinput signal IN is a high level signal, it can be ensured that when thepreset node NY is a low level signal, the output signal OUT is a lowlevel signal. Hereinafter, a detailed description will be given inconjunction with typical examples of the first control part 110, andrepetition is not made herein.

With continued reference to FIG. 2 , in an embodiment, in the N stagesof shift registers of the driver circuit 10, the signal of the thirdnode N3 of the shift register at the M1-th stage is connected to aninput signal IN terminal of the shift register at the (M1+1)-th stageand is used as the input signal IN of the shift register at the(M1+1)-th stage, where 1≤M1≤N.

In an embodiment, the signal of the third node N3 of the shift registerat this stage is the input signal IN of the shift register at the nextstage so that the cascade of the N stages of shift registers can beachieved. The input signal IN of the shift register at the first stagemay be provided by the driver chip 20.

FIG. 16 is a circuit element diagram of a shift register according to anembodiment of the present disclosure. FIG. 17 is a circuit elementdiagram of another shift register according to an embodiment of thepresent disclosure. FIG. 18 is a circuit element diagram of anothershift register according to an embodiment of the present disclosure.FIG. 19 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure. In the shift register shownin FIG. 16 and the shift register shown in FIG. 17 , the third node N3is set as the preset node. In the shift register shown in FIG. 18 andthe shift register shown in FIG. 19 , the second node N2 is set as thepreset node. Each of the first control unit 121 of the shift registershown in FIG. 16 and the first control unit 121 of the shift registershown in FIG. 18 includes the first gating unit 1211. Each of the firstcontrol unit 121 of the shift register shown in FIG. 17 and the firstcontrol unit 121 of the shift register shown in FIG. 19 includes thefirst gating unit 1211 and the second gating unit 1212. With continuedreference to FIGS. 16 to 19 , in an embodiment, the second control unit122 includes a third transistor M3 and a fourth transistor M4, where asource of the third transistor M3 is configured to receive the thirdvoltage signal VGL2, a drain of the third transistor M3 is connected toan output signal OUT terminal, and a gate of the third transistor M3 isconnected to the fourth node N4; a source of the fourth transistor M4 isconfigured to receive the fourth voltage signal VGH2, a drain of thefourth transistor M4 is connected to the output signal OUT terminal, anda gate of the fourth transistor M4 is connected to the fifth node N5.That is, the first sub-control unit 1221 includes the third transistorM3, and the second sub-control unit 1222 includes the fourth transistorM4.

In an embodiment, the third transistor M3 and the fourth transistor M4are both PMOS type transistors.

In an embodiment, when the fourth node N4 is at a low level, the thirdtransistor M3 is turned on, the third voltage signal VGL2 is transmittedto the drain of the third transistor M3, and the output signal OUT isgenerated. When the fourth node N4 is at a high level, the thirdtransistor M3 is turned off. When the fifth node N5 is at a low level,the fourth transistor M4 is turned on, the fourth voltage signal VGH2 istransmitted to the drain of the fourth transistor M4, and the outputsignal OUT is generated. When the fifth node N5 is at a high level, thefourth transistor M4 is turned off. That is, the low level signal of theoutput signal OUT is determined by the fourth node N4, and the highlevel signal of the output signal OUT is determined by the fifth nodeN5.

It is to be understood that the third transistor M3 and the fourthtransistor M4 respectively generate output signals OUT under the controlof the fourth node N4 and the fifth node N5, the high level signal ofthe fourth node N4 and the high level signal of the fifth node N5 arethe second voltage signal VGH1, the low level signal of the fourth nodeN4 includes the first voltage signal VGL1 and a low level signal with avoltage value lower than the voltage value of the first voltage signalVGL1, and the low level signal of the fifth node N5 is the first voltagesignal VGL1. That is, control signals of the second control unit 122 arethe first voltage signal VGL1, the low level signal with a voltage valuelower than the voltage value of the first voltage signal VGL1, and thesecond voltage signal VGH1; and received signals of the second controlunit 122 are the third voltage signal VGL2 and the fourth voltage signalVGH2.

Therefore, when the potential of the first voltage signal VGL1 is lowerthan the potential of the third voltage signal VGL2, and/or thepotential of the second voltage signal VGH1 is higher than the potentialof the fourth voltage signal VGH2, the voltage value of the controlsignal of the second control unit 122 is higher than or lower than thevoltage value of the received signal.

For the PMOS type third transistor M3 and the PMOS type fourthtransistor M4, when a low level signal is received and the voltage valueof the control signal is lower than the voltage value of the receivedlow level signal, it can be ensured that the PMOS type transistorsoperate in a relatively saturated state, so that the stability of theoutput signal OUT can be ensured, and the tailing of the signal outputcan be weakened. In addition, when the control signal is a higher highlevel signal, if the signal received by the PMOS type transistor is alsoa high level signal, it can be ensured that the PMOS type transistor maybe fully turned off, and the risk of electric leakage can be fullyreduced. Therefore, in embodiments of the present disclosure, thestability of the output waveform can be fully improved, and theoccurrence of problems such as tailing and leakage current can beavoided.

With continued reference to FIG. 6 and FIGS. 16 to 19 , in anembodiment, the first control part 110 includes a third control unit111, a fourth control unit 112, and a fifth control unit 113. The thirdcontrol unit 111 is configured to receive the input signal IN andcontrol a signal of a sixth node N6 in response to the first clocksignal, where the sixth node N6 is connected to the first node N1. Thefourth control unit 112 is configured to receive the second voltagesignal VGH1 and control the signal of the second node N2 in response toat least the input signal IN and the signal of the sixth node N6. Thefifth control unit 113 is configured to receive the first voltage signalVGL1 and the second voltage signal VGH1 and control the signal of thethird node N3 in response to the signal of the first node N1 and thesignal of the second node N2.

With continued reference to FIG. 6 and FIGS. 16 to 19 , in anembodiment, the third control unit 111 includes a fifth transistor M5,the fourth control unit 112 includes a sixth transistor M6, a seventhtransistor M7, an eighth transistor M8, and a fourth capacitor C4, andthe fifth control unit 113 includes a tenth transistor M10, an eleventhtransistor M11, a twelfth transistor M12, a second capacitor C2, and athird capacitor C3. A source of the fifth transistor M5 is connected tothe input signal IN, a drain of the fifth transistor M5 is connected tothe sixth node N6, and a gate of the fifth transistor M5 is connected tothe first clock signal. A source of the sixth transistor M6 is connectedto the first clock signal, a drain of the sixth transistor M6 isconnected to the second node N2, and a gate of the sixth transistor M6is connected to a seventh node N7. A source of the seventh transistor M7is connected to the first voltage signal VGL1, a drain of the seventhtransistor M7 is connected to the seventh node N7, and a gate of theseventh transistor M7 is connected to the input signal IN. A source ofthe eighth transistor M8 is connected to the first voltage signal VGL1,a drain of the eighth transistor M8 is connected to the second node N2,and a gate of the eighth transistor M8 is connected to the sixth nodeN6. A first electrode plate of the fourth capacitor C4 is connected tothe first clock signal, and a second electrode plate of the fourthcapacitor C4 is connected to the seventh node N7. A source of the tenthtransistor M10 is connected to the second voltage signal VGH1, a drainof the tenth transistor M10 is connected to the third node N3, and agate of the tenth transistor M10 is connected to the first node N1. Adrain of the eleventh transistor M11 is connected to the third node N3,and a gate of the eleventh transistor M11 is connected to the secondnode N2. A source of the twelfth transistor M12 is connected to thefirst voltage signal VGL1, a drain of the twelfth transistor M12 isconnected to a source of the eleventh transistor M11, and a gate of thetwelfth transistor M12 is connected to the second node N2. A firstelectrode plate of the second capacitor C2 is connected to the firstnode N1, and a second electrode plate of the second capacitor C2 isconnected to the third node N3. A first electrode plate of the thirdcapacitor C3 is connected to the second node N2, and a second electrodeplate of the third capacitor C3 is connected to the first voltage signalVGL1.

With continued reference to FIG. 6 and FIGS. 16 to 19 , in anembodiment, the first control part 110 further includes a ninthtransistor M9 and a thirteenth transistor M13. A source of the ninthtransistor M9 is connected to the first node N1, a drain of the ninthtransistor M9 is connected to the sixth node N6, and a gate of the ninthtransistor M9 is connected to the second voltage signal VGH1. A sourceof the thirteenth transistor M13 is connected to the second voltagesignal VGH1, a drain of the thirteenth transistor M13 is connected tothe source of the eleventh transistor M11, and a gate of the thirteenthtransistor M13 is connected to the third node N3.

For example, FIG. 20 is a timing sequence diagram of a shift registeraccording to an embodiment of the present disclosure. The timingsequence diagram shown in FIG. 20 is applicable to the shift registersshown in FIGS. 16 and 17 , where the signal of the third node N3 of theshift register at this stage is used as the input signal IN of the shiftregister at the next stage, and the signal of the third node N3 of theshift register at the next stage is used as the first output controlsignal CRL of the shift register at this stage. Referring to FIGS. 16and 20 , the operating process of the shift register shown in FIG. 16 isdescribed below.

In a T1 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a high level, the fifth transistor M5 isturned off, the seventh transistor M7 is turned on, the turned-onseventh transistor M7 transmits the first voltage signal VGH1 to theseventh node N7, the sixth node N6 is maintained at a high level, theeighth transistor M8 is turned off, the second node N2 is maintained ata low level, and the fifth node N5 is maintained at a low level, so thatthe fourth transistor M4 is turned on. Since the ninth transistor M9 isnormally on, the level of the first node N1 and the level of the sixthnode N6 are the same and are both high, so that the tenth transistor M10is turned off, and the second node N2 is at a low level; the eleventhtransistor M11 and the twelfth transistor M12 are turned on, and thefirst voltage signal VGH1 is transmitted to the third node N3; the thirdnode N3 is at a high level; the first transistor M1 is turned on, andthe turned-on first transistor M1 transmits the high level of the thirdnode N3 to the fourth node N4; and the third transistor M3 is turnedoff. The fourth voltage signal VGH2 is transmitted to an output terminalthrough the turned-on fourth transistor M4, so that the output signalOUT is at a high level.

In a T2 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 isturned on, and the input signal IN is transmitted to the sixth node N6,so that the sixth node N6 is at a low level; the first node N1 is at alow level, the tenth transistor M10 is turned on, and the first voltagesignal VGL1 is transmitted to the third node N3; the first transistor M1is turned on, and the low level of the third node N3 is transmitted tothe fourth node N4 through the turned-on first transistor M1; the thirdtransistor M3 is turned on, the seventh transistor M7 is turned on, andthe second voltage signal VGH1 is transmitted to the seventh node N7;the seventh node N7 is at a high level, the sixth transistor M6 isturned off, the low level of the sixth node N6 turns on the eighthtransistor M8, and the high level of the first voltage signal VGH1 istransmitted to the second node N2; the fifth node N5 is at a high level;the fourth transistor M4 is turned off, and the third voltage signalVGL2 is transmitted to the output terminal through the turned-on thirdtransistor M3; and the output signal OUT is at a low level.

In a T3 stage, the input signal IN is at a low level, and the firstclock signal (the CK signal) is at a high level; under the action of thefourth capacitor C4, the seventh node N7 is at a high level, the fifthtransistor M5 is turned off, the sixth node N6 is maintained at a lowlevel, the first node N1 is maintained at a low level, the tenthtransistor M10 is turned on, and the third node N3 is maintained at alow level. Since the first output control signal CRL and the signal ofthe preset node (the third node N3) are both at a low level, the firsttransistor M1 is turned off, the fourth node N4 becomes a low level witha lower voltage value under the action of the first output controlsignal CRL, the third transistor M3 is kept on, the high level of theseventh node N7 turns off the sixth transistor M6, the second node N2 ismaintained at a high level, the fifth node N5 is at a high level, thefourth transistor M4 is kept off, and the output signal OUT is at a lowlevel.

In a T4 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 isturned on, and the input signal IN is transmitted to the sixth node N6,so that the sixth node N6 is maintained at a low level, and the firstnode N1 is maintained at a low level; the third node N3 is maintained ata low level, the first transistor M1 is turned off, the fourth node N4is maintained at a low level with a lower voltage value, the seventhtransistor M7 is turned on, and the second voltage signal VGH1 istransmitted to the seventh node N7; the seventh node N7 is at a highlevel, the sixth transistor M6 is turned off, the second node N2 ismaintained at a high level, the fifth node N5 is maintained at a highlevel, and the output signal OUT is maintained at a low level.

In a T5 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a high level, the fifth transistor M5 isturned off, the sixth node N6 is maintained at a low level, and thefirst node N1 is maintained at a low level, so that the third node N3 ismaintained at a low level, the first transistor M1 is turned off, andthe fourth node N4 is maintained at a low level with a lower voltagevalue; under the action of the fourth capacitor C4, the seventh node N7is at a high level, the sixth transistor M6 is turned off, and thesecond node N2 is maintained at a high level; the fifth node N5 is at ahigh level, and the output signal OUT is maintained at a low level.

In a T6 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 isturned on, the seventh transistor M7 is turned off, and the turned-onfifth transistor M5 transmits the input signal IN to the sixth node N6,so that the sixth node N6 is at a high level, and the first node N1 isat a high level; under the action of the fourth capacitor C4, theseventh node N7 is at a low level; the sixth transistor M6 is turned on,and the turned-on sixth transistor M6 transmits the low level of thefirst clock signal (the CK signal) to the second node N2; the eleventhtransistor M11 and the twelfth transistor M12 are turned on, the secondvoltage signal VGH1 is transmitted to the third node N3 through theturned-on eleventh transistor M11 and the turned-on twelfth transistorM12, the first transistor M1 is turned on, the high level of the thirdnode N3 is transmitted to the fourth node N4, the third transistor M3 isturned off, the low level of the second node N2 causes the fifth node N5to be at a low level, and the fourth transistor M4 is turned on; and theoutput signal OUT is at a high level.

With continued reference to FIG. 20 , it is to be noted that the fourthnode N4 and the preset node (the third node N3) are both low levelsignals in the T2 to T5 stages, and at the junction of the T2 stage andthe T3 stage, the first output control signal CRL transits from a highlevel signal to a low level signal, and the fourth node N4 transits froma low level signal to a low level signal with a lower voltage valuethrough the coupling effect of the first capacitor C1, so that the thirdtransistor M3 can be turned on more fully, and thus tailing can beavoided. It is also to be noted that in the T3 to T5 stages, when thesignal of the preset node (the third node N3) and the first outputcontrol signal CRL are both low level signals, the fifth voltage signalVGL3 controls the first transistor M1 to be turned off. In this manner,the signal change of the fourth node N4 can be prevented from returningto the preset node NY, to prevent the signal change of the fourth nodeN4 from causing the signal change of the preset node NY. The signal ofthe third node N3 is the input of the shift register at the next stage.In this manner, the output of the shift register at the next stage canbe prevented from being affected.

With continued reference to FIGS. 17 and 20 , the operating timingsequence of the shift register shown in FIG. 17 is similar to theoperating timing sequence of the shift register shown in FIG. 16 . Thedifference is that in the T2 to T5 stages, the preset node (the thirdnode N3) is a low level signal, the second transistor M2 is turned on,and the first output control signal CRL may act on the fourth node N4through the first capacitor C1; in the T1 and T6 stages, the preset node(the third node N3) is a low level signal, the second transistor M2 isturned off, and the first output control signal CRL cannot betransmitted to the first capacitor C1. In this manner, it can be ensuredthat only when the preset node (the third node N3) is a low levelsignal, the first output control signal CRL is connected to the shiftregister at this stage, and the first output control signal CRL is notallowed to affect the potential of the fourth node N4 at other times. Inthis manner, it can be ensured that the circuit is more stable when thepreset node (the third node N3) is a high level signal.

It is to be noted that, as shown in FIG. 20 , in the case of |M1−M2|=1,that is, M2 is the next stage or the previous stage of M1. Herein, thecase where M2 is the next stage of M1 is used as an example. In thiscase, the first clock signal received by the shift register at the M1-thstage is the CK signal, the first clock signal received by the shiftregister at the M2-th stage is the XCK signal, and the input signal ofthe shift register at the M2-th stage is the signal of the third node N3of the shift register at the M1-th stage. When the XCK signal changesfrom a high level to a low level, that is, when the T3 stage in FIG. 20starts, the signal of the third node N3 of the shift register at theM2-th stage becomes a low level signal, so that the first output controlsignal CRL becomes a low level signal. In this case, the first outputcontrol signal CRL pulls down the potential of the fourth node N4, sothat the stable output of the low level output signal of the shiftregister at the M1-th stage can be ensured.

In addition, it is to be noted that, as described above, since theeffective pulse time of the CK signal and the effective pulse time ofthe XCK signal do not overlap, and to fully simplify the process, thewaveform of the CK signal is often the same as the waveform of the XCKsignal, and the difference only exists in the timing. In this case, wheneach of the CK signal and the XCK signal transits once, the outputsignal of the shift register is shifted twice toward the next stage andthe stage next to the next stage. In conjunction with the precedinganalysis, when the pulse period of the first clock signal is S1, thewidth of the low level pulse of the output signal OUT is S2, whereS2=a×S1. Since when the first clock signal passes through one pulseperiod, each of the CK signal and the XCK signal transits once, then inthe case of i≤2a, during at least part of the time period during whichthe shift register at the M1-th stage outputs a low level output signalOUT, the signal of the preset node of the shift register at the M2-thstage may be a low level signal and may be used as the first outputcontrol signal CRL received by the shift register at the M1-th stage, sothat the potential of the fourth node N4 can be pulled down, and thestable output of the low level output signal OUT can be ensured.

For example, FIG. 21 is a timing sequence diagram of another shiftregister according to an embodiment of the present disclosure. Thetiming sequence diagram shown in FIG. 21 is applicable to the shiftregisters shown in FIGS. 18 and 19 , where the signal of the third nodeN3 of the shift register at this stage is used as the input signal IN ofthe shift register at the next stage, and the signal of the second nodeN2 of the shift register at the next stage is used as the first outputcontrol signal CRL of the shift register at this stage. Referring toFIGS. 18 and 21 , the operating process of the shift register shown inFIG. 18 is described below.

In a T1 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a high level, the fifth transistor M5 andthe seventh transistor M7 are turned off, the seventh node N7 ismaintained at a high level, the sixth node N6 is maintained at a lowlevel, the eighth transistor M8 is turned on, and the second voltagesignal VGH1 is transmitted to the second node N2, so that the secondnode N2 is at a high level; the eleventh transistor M11 and the twelfthtransistor M12 are turned off, the first transistor M1 is turned on, andthe high level of the second node N2 is transmitted to the fourth nodeN4; and the third transistor M3 is turned off. Since the ninthtransistor M9 is normally open, the level of the first node N1 and thelevel of the sixth node N6 are the same and are both low, so that thetenth transistor M10 is turned on, and the first voltage signal VGL1 istransmitted to the third node N3; the third node N3 is at a low level,and the fifth node N5 is at a low level; the fourth transistor M4 isturned on, and the fourth voltage signal VGH2 is transmitted to theoutput terminal; and the output signal OUT is at a high level.

In a T2 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 isturned on, and the input signal IN is transmitted to the sixth node N6,so that the sixth node N6 is at a high level; the first node N1 is at ahigh level, and the tenth transistor M10 is turned off; under the actionof the fourth capacitor C4, the seventh node N7 is at a low level, thesixth transistor M6 is turned on, and the first clock signal (the CKsignal) is transmitted to the second node N2; the second node N2 is at alow level, the eleventh transistor M11, the twelfth transistor M12, andthe first transistor M1 are turned on, and the second voltage signalVGH1 is transmitted to the third node N3; the third node N3 is at a highlevel, and the fifth node N5 is at a high level; the fourth transistorM4 is turned off, the first transistor M1 is turned on, and the lowlevel of the second node N2 is transmitted to the fourth node N4; thethird transistor M3 is turned on, and the turned-on third transistor M3transmits the second voltage signal VGL2 to the output terminal; and theoutput signal OUT is at a low level.

In a T3 stage, the input signal IN is at a high level, and the firstclock signal (the CK signal) is at a high level; under the action of thefourth capacitor C4, the seventh node N7 is at a high level, the fifthtransistor M5 is turned off, the sixth node N6 is maintained at a highlevel, the first node N1 is maintained at a high level, the sixthtransistor M6 and the eighth transistor M8 are turned off, and thesecond node N2 is maintained at a low level. Since the first outputcontrol signal CRL and the signal of the preset node (the second nodeN2) are both at low levels, the first transistor M1 is turned off, thefourth node N4 becomes a low level with a lower voltage value under theaction of the first output control signal CRL, the third transistor M3is kept on, the third node N3 is maintained at a high level, the fifthnode N5 is maintained at a high level, the fourth transistor M4 is keptoff, and the output signal OUT of M3 is at a low level.

In a T4 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 isturned on, and the input signal IN is transmitted to the sixth node N6,so that the sixth node N6 is maintained at a high level, and the firstnode N1 is maintained at a high level; under the action of the fourthcapacitor C4, the seventh node N7 is at a low level, the sixthtransistor M6 is turned on, and the first clock signal (the CK signal)is transmitted to the second node N2; the second node N2 is maintainedat a low level, the fourth node N4 is maintained at a low level with alower voltage value, the third node N3 is maintained at a high level,the fifth node N5 is maintained at a high level, and the output signalOUT is maintained at a low level.

In a T5 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a high level, the fifth transistor M5 isturned off, the sixth node N6 is maintained at a high level, the firstnode N1 is maintained at a high level, the seventh transistor M7 isturned on, and the second voltage signal VGL1 is transmitted to theseventh node N7, so that the seventh node N7 is at a high level; and thesecond node N2 is maintained at a low level, the fourth node N4 ismaintained at a low level with a lower voltage value, the third node N3is maintained at a high level, the fifth node N5 is maintained at a highlevel, and the output signal OUT is maintained at a low level.

In a T6 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a low level, the fifth transistor M5 andthe seventh transistor M7 are turned on, and the turned-on fifthtransistor M5 transmits the input signal IN to the sixth node N6, sothat the sixth node N6 is at a low level, the first node N1 is at a lowlevel, and the turned-on seventh transistor M7 transmits the secondvoltage signal VGH1 to the seventh node N7; the seventh node N7 is at ahigh level, the sixth transistor M6 is turned off, and the turned-oneighth transistor M8 transmits the second voltage signal VGH1 to thesecond node N2; the second node N2 is at a high level; the eleventhtransistors M11 and the twelfth transistor M12 are turned off, the firsttransistor M1 is turned on, and the high level of the second node N2 istransmitted to the fourth node N4; the third transistor M3 is turnedoff, the tenth transistor M10 is turned on, and the first voltage signalVGL1 is transmitted to the third node N3; and the third node N3 is at alow level, the fifth node N5 is at a low level, and the fourthtransistor M4 is turned on. The turned-on fourth transistor M4 transmitsthe fourth voltage signal VGH2 to the output terminal, so that theoutput signal OUT is at a high level.

With continued reference to FIG. 21 , it is to be noted that the fourthnode N4 and the preset node (the second node N2) are both low levelsignals in the T2 to T5 stages, and at the junction of the T2 stage andthe T3 stage, the first output control signal CRL transits from a highlevel signal to a low level signal, and the fourth node N4 transits froma low level signal to a low level signal with a lower voltage valuethrough the coupling effect of the first capacitor C1, so that the thirdtransistor M3 can be turned on more fully, and thus tailing can beavoided. It is also to be noted that in the T3 to T5 stages, when thesignal of the preset node (the second node N2) and the first outputcontrol signal CRL are both low level signals, the fifth voltage signalVGL3 controls the first transistor M1 to be turned off. In this manner,the signal change of the fourth node N4 can be prevented from returningto the preset node, to prevent the signal change of the fourth node N4from causing the signal change of the preset node.

With continued reference to FIGS. 19 and 21 , the operating timingsequence of the shift register shown in FIG. 19 is similar to theoperating timing sequence of the shift register shown in FIG. 18 . Thedifference is that in the T2 to T5 stages, the preset node (the secondnode N2) is a low level signal, the second transistor M2 is turned on,and the first output control signal CRL may act on the fourth node N4through the first capacitor C1; and in the T1 and T6 stages, the presetnode (the second node N2) is a low level signal, the second transistorM2 is turned off, and the first output control signal CRL cannot betransmitted to the first capacitor C1. In this manner, it can be ensuredthat only when the preset node (the second node N2) is a low levelsignal, the first output control signal CRL is connected to the shiftregister at this stage, and the first output control signal CRL is notallowed to affect the potential of the fourth node N4 at other times. Inthis manner, it can be ensured that the circuit is more stable when thepreset node (the second node N2) is a high level signal.

FIG. 22 is a circuit element diagram of a shift register according to anembodiment of the present disclosure. FIG. 23 is a circuit elementdiagram of another shift register according to an embodiment of thepresent disclosure. FIG. 24 is a circuit element diagram of anothershift register according to an embodiment of the present disclosure.FIG. 25 is a circuit element diagram of another shift register accordingto an embodiment of the present disclosure. In the shift register shownin FIG. 22 and the shift register shown in FIG. 23 , the third node N3is set as the preset node. In the shift register shown in FIG. 24 andthe shift register shown in FIG. 25 , the second node N2 is set as thepreset node. Each of the first control unit 121 of the shift registershown in FIG. 22 and the first control unit 121 of the shift registershown in FIG. 24 includes the first gating unit 1211. Each of the firstcontrol unit 121 of the shift register shown in FIG. 23 and the firstcontrol unit 121 of the shift register shown in FIG. 25 includes thefirst gating unit 1211 and the second gating unit 1212. With continuedreference to FIG. 7 and FIGS. 22 to 25 , in an embodiment, the firstcontrol part 110 includes the third control unit 111, the fourth controlunit 112, and the fifth control unit 113. The third control unit 111 isconfigured to receive the input signal IN and control the signal of thesixth node N6 in response to the first clock signal, where the sixthnode N6 is connected to the first node N1. The fourth control unit 112is configured to receive the first voltage signal VGL1 and the secondvoltage signal VGH1 and control the signal of the second node N2 inresponse to the signal of the sixth node N6, the first clock signal, andthe second clock signal. The fifth control unit 113 is configured toreceive the first voltage signal VGL1 and the second voltage signal VGH1and control the signal of the third node N3 in response to the signal ofthe first node N1 and the signal of the second node N2.

With continued reference to FIGS. 23 to 25 , in an embodiment, the thirdcontrol unit 111 includes the fifth transistor M5, the fourth controlunit 112 includes the sixth transistor M6, the seventh transistor M7,the eighth transistor M8, the ninth transistor M9, the tenth transistorM10, the eleventh transistor M11, the twelfth transistor M12, thethirteenth transistor M13, a fourteenth transistor M14, and a fifthcapacitor C5; and the fifth control unit 113 includes a fifteenthtransistor M15, a sixteenth transistor M16, the third capacitor C3, andthe fourth capacitor C4. The source of the fifth transistor M5 isconnected to the input signal IN, the drain of the fifth transistor M5is connected to the sixth node N6, and the gate of the fifth transistorM5 is connected to the first clock signal. The source of the sixthtransistor M6 is connected to the sixth node N6, the drain of the sixthtransistor M6 is connected to the drain of the seventh transistor M7,and the gate of the sixth transistor M6 is connected to the second clocksignal. The source of the seventh transistor M7 is connected to thefirst voltage signal VGL1, the drain of the seventh transistor M7 isconnected to the drain of the sixth transistor M6, and the gate of theseventh transistor M7 is connected to an eighth node N8. The source ofthe eighth transistor M8 is connected to the first clock signal, thedrain of the eighth transistor M8 is connected to the eighth node N8,and the gate of the eighth transistor M8 is connected to the sixth nodeN6. The source of the ninth transistor M9 is connected to the secondclock signal, the drain of the ninth transistor M9 is connected to theeighth node N8, and the gate of the ninth transistor M9 is connected tothe first clock signal. The source of the tenth transistor M10 isconnected to the second clock signal, the drain of the tenth transistorM10 is connected to the seventh node N7, and the gate of the tenthtransistor M10 is connected to the eighth node N8. The source of theeleventh transistor M11 is connected to the seventh node N7, the drainof the eleventh transistor M11 is connected to the second node N2, andthe gate of the eleventh transistor M11 is connected to the second clocksignal. The source of the twelfth transistor M12 is connected to thefirst voltage signal VGL1, the drain of the twelfth transistor M12 isconnected to the second node N2, and the gate of the twelfth transistorM12 is connected to the sixth node N6. The source of the thirteenthtransistor M13 is connected to the eighth node N8, the drain of thethirteenth transistor M13 is connected to the gate of the tenthtransistor M10, and the gate of the thirteenth transistor M13 isconnected to the second voltage signal VGH1. A source of the fourteenthtransistor M14 is connected to the sixth node N6, a drain of thefourteenth transistor M14 is connected to the first node N1, and a gateof the fourteenth transistor M14 is connected to the second voltagesignal VGH1. A first electrode plate of the fifth capacitor C5 isconnected to the drain of the thirteenth transistor M13, and a secondelectrode plate of the fifth capacitor C5 is connected to the seventhnode N7. A source of the fifteenth transistor M15 is connected to thefirst voltage signal VGL1, a drain of the fifteenth transistor M15 isconnected to the third node N3, and a gate of the fifteenth transistorM15 is connected to the second node N2. A source of the sixteenthtransistor M16 is connected to the second voltage signal VGH1, a drainof the sixteenth transistor M16 is connected to the third node N3, and agate of the sixteenth transistor M16 is connected to the first node N1.The first electrode plate of the third capacitor C3 is connected to thefirst voltage signal VGL1, and the second electrode plate of the thirdcapacitor C3 is connected to the second node N2. The first electrodeplate of the fourth capacitor C4 is connected to the second clock signalor the second voltage signal VGH1, and the second electrode plate of thefourth capacitor C4 is connected to the first node N1.

With continued reference to FIGS. 23 to 25 , in an embodiment, the firstcontrol part 110 further includes the second capacitor C2, where thefirst electrode plate of the second capacitor C2 is connected to thethird node N3, and the second electrode plate of the second capacitor C2is connected to the second voltage signal VGH1.

For example, FIG. 26 is a timing sequence diagram of another shiftregister according to an embodiment of the present disclosure. Thetiming sequence diagram shown in FIG. 26 is applicable to the shiftregisters shown in FIGS. 22 and 23 , where the signal of the third nodeN3 of the shift register at this stage is used as the input signal IN ofthe shift register at the next stage, and the signal of the third nodeN3 of the shift register at the next stage is used as the first outputcontrol signal CRL of the shift register at this stage. Referring toFIGS. 22 and 26 , the operating process of the shift register shown inFIG. 22 is described below.

In a T1 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a high level, the second clock signal (theXCK signal) is at a low level, the fifth transistor M5 is turned off,the ninth transistor M9 is turned off, the sixth node N6 is maintainedat a high level, the sixth transistor M6 is turned on, the eighthtransistor M8 is turned off, the eighth node N8 is maintained at a lowlevel, the tenth transistor M10 is turned on, and the second clocksignal (the XCK signal) is transmitted to the seventh node N7, so thatthe seventh node N7 is at a low level, the eleventh transistor M11 isturned on, and the signal of the seventh node N7 is transmitted to thesecond node N2; the second node N2 is at a low level, the fifteenthtransistor M15 is turned on, and the second voltage signal VGH1 istransmitted to the third node N3; the third node N3 is at a high level,the first transistor M1 is turned on, the fourth node N4 is at a highlevel, the third transistor M3 is turned off, and the second node N2 isat a low level; the fifth node N5 is at a low level, the fourthtransistor M4 is turned on, and the fourth voltage signal VGH2 istransmitted to the output terminal; and the output signal OUT is at ahigh level.

In a T2 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a low level, the second clock signal (theXCK signal) is at a high level, the fifth transistor M5 is turned on,and the input signal IN is transmitted to the sixth node N6, so that thesixth node N6 is at a low level, the ninth transistor M9 is turned on,and the first voltage signal VGL1 is transmitted to the eighth node N8;the eighth node N8 is at a low level, the tenth transistor M10 is turnedon, the seventh node N7 is maintained at a high level, the sixthtransistor M6 is turned off, the eleventh transistor M11 is turned off,the sixth node N6 controls the twelfth transistor M12 to be turned on,and the second voltage signal VGH1 is transmitted to the second node N2;the second node N2 is at a high level, the fifteenth transistor M15 isturned off, and the high level of the second node N2 is transmitted tothe fifth node N5; the fourth transistor M4 is turned off, thefourteenth transistor M14 is turned on, the signal of the sixth node N6is transmitted to the first node N1, the first node N1 is at a lowlevel, the first node N1 controls the sixteenth transistor M16 to beturned on, and the first voltage signal VGL1 is transmitted to the thirdnode N3; the third node N3 is at a low level, the first transistor M1 isturned on, the fourth node N4 is at a low level, the third transistor M3is turned on, and the third voltage signal VGL3 is transmitted to theoutput terminal; and the output signal OUT is at a low level.

In a T3 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a high level, the second clock signal (theXCK signal) is at a low level, the fifth transistor M5 is turned off,the ninth transistor M9 is turned off, the sixth node N6 is maintainedat a low level, the sixth transistor M6 is turned on, the eighthtransistor M8 is turned on, and the high level of the first clock signal(the CK signal) is written into the eighth node N8, so that the eighthnode N8 is at a high level, the tenth transistor M10 is turned off, theseventh node N7 is maintained at a high level, the eleventh transistorM11 is turned on, and the signal of the seventh node N7 is transmittedto the second node N2; the second node N2 is at a high level, thefifteenth transistor M15 is turned off, and the high level of the secondnode N2 is transmitted to the fifth node N5; the fourth transistor M4 isturned off, the fourteenth transistor M14 is turned on, the signal ofthe sixth node N6 is transmitted to the first node N1, the first node N1is at a low level, the first node N1 controls the sixteenth transistorM16 to be turned on, and the first voltage signal VGL1 is transmitted tothe third node N3; and the third node N3 is at a low level. Since thefirst output control signal CRL and the signal of the preset node (thethird node N3) are both at low levels, the first transistor M1 is turnedoff, the fourth node N4 becomes a low level with a lower voltage valueunder the action of the first output control signal CRL, the thirdtransistor M3 is kept on, and the third voltage signal VGL3 istransmitted to the output terminal, so that the output signal OUT is ata low level.

In a T4 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the second clock signal (theXCK signal) is at a high level, the fifth transistor M5 is turned on,and the input signal IN is transmitted to the sixth node N6, so that thesixth node N6 is at a high level, the ninth transistor M9 is turned on,and the first voltage signal VGL1 is transmitted to the eighth node N8;the eighth node N8 is at a low level, the tenth transistor M10 is turnedon, and the second clock signal (the XCK signal) is transmitted to theseventh node N7; the seventh node N7 is maintained at a high level, thesixth transistor M6 is turned off, the eleventh transistor M11 is turnedoff, the twelfth transistor M12 is turned off, the second node N2 ismaintained at a high level, the fifth node N5 is at a high level, thefourth transistor M4 is turned off, the fourteenth transistor M14 isturned on, the signal of the sixth node N6 is transmitted to the firstnode N1, the first node N1 is at a low level, the first node N1 controlsthe sixteenth transistor M16 to be turned on, and the first voltagesignal VGL1 is transmitted to the third node N3; the third node N3 is ata low level, the first transistor M1 is turned off, the fourth node N4is maintained at a low level with a lower voltage value, the thirdtransistor M3 is turned on, and the third voltage signal VGL3 istransmitted to the output terminal; and the output signal OUT is at alow level.

In a T5 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a high level, the second clock signal (theXCK signal) is at a low level, the fifth transistor M5 is turned off,the ninth transistor M9 is turned off, the sixth node N6 is maintainedat a high level, the sixth transistor M6 is turned on, the eighthtransistor M8 is turned off, the eighth node N8 is maintained at a lowlevel, the tenth transistor M10 is turned on, and the second clocksignal (the XCK signal) is transmitted to the seventh node N7, so thatthe seventh node N7 is at a low level, the eleventh transistor M11 isturned on, and the signal of the seventh node N7 is transmitted to thesecond node N2; the second node N2 is at a low level, the fifteenthtransistor M15 is turned on, and the second voltage signal VGH1 istransmitted to the third node N3; the third node N3 is at a high level,the first transistor M1 is turned on, the fourth node N4 is at a highlevel, the third transistor M3 is turned off, and the second node N2 isat a low level; the fifth node N5 is at a low level, the fourthtransistor M4 is turned on, and the fourth voltage signal VGH2 istransmitted to the output terminal; and the output signal OUT is at ahigh level.

With continued reference to FIG. 26 , it is to be noted that the fourthnode N4 and the preset node (the third node N3) are both low levelsignals in the T2 to T4 stages, and at the junction of the T2 stage andthe T3 stage, the first output control signal CRL transits from a highlevel signal to a low level signal, and the fourth node N4 transits froma low level signal to a low level signal with a lower voltage valuethrough the coupling effect of the first capacitor C1, so that the thirdtransistor M3 can be turned on more fully, and thus tailing can beavoided. It is also to be noted that in the T3 to T4 stages, when thesignal of the preset node (the third node N3) and the first outputcontrol signal CRL are both low level signals, the fifth voltage signalVGL3 controls the first transistor M1 to be turned off. In this manner,the signal change of the fourth node N4 can be prevented from returningto the preset node, to prevent the signal change of the fourth node N4from causing the signal change of the preset node. The signal of thethird node N3 is the input of the shift register at the next stage. Inthis manner, the output of the shift register at the next stage can beprevented from being affected.

With continued reference to FIGS. 23 and 26 , the operating timingsequence of the shift register shown in FIG. 23 is similar to theoperating timing sequence of the shift register shown in FIG. 22 . Thedifference is that in the T2 to T4 stages, the preset node (the thirdnode N3) is a low level signal, the second transistor M2 is turned on,and the first output control signal CRL may act on the fourth node N4through the first capacitor C1; and in the T1 and T5 stages, the presetnode (the third node N3) is a low level signal, the second transistor M2is turned off, and the first output control signal CRL cannot betransmitted to the first capacitor C1. In this manner, it can be ensuredthat only when the preset node (the third node N3) is a low levelsignal, the first output control signal CRL is connected to the shiftregister at this stage, and the first output control signal CRL is notallowed to affect the potential of the fourth node N4 at other times. Inthis manner, it can be ensured that the circuit is more stable when thepreset node (the third node N3) is a high level signal.

For example, FIG. 27 is a timing sequence diagram of another shiftregister according to an embodiment of the present disclosure. Thetiming sequence diagram shown in FIG. 27 is applicable to the shiftregisters shown in FIGS. 24 and 25 , where the signal of the third nodeN3 of the shift register at this stage is used as the input signal IN ofthe shift register at the next stage, and the signal of the second nodeN2 of the shift register at the next stage is used as the first outputcontrol signal CRL of the shift register at this stage. Referring toFIGS. 24 and 27 , the operating process of the shift register shown inFIG. 24 is described below.

In a T1 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the second clock signal (theXCK signal) is at a high level, the fifth transistor M5 is turned on,and the input signal IN is transmitted to the sixth node N6, so that thesixth node N6 is at a high level, the ninth transistor M9 is turned on,and the first voltage signal VGL1 is transmitted to the eighth node N8;the eighth node N8 is at a low level, the tenth transistor M10 is turnedon, the second clock signal (the XCK signal) is transmitted to theseventh node N7, the seventh node N7 is maintained at a high level, thesixth transistor M6 is turned off, the eleventh transistor M11 is turnedoff, the twelfth transistor M12 is turned off, the second node N2 ismaintained at a high level, the fifteenth transistor M15 is turned off,the first transistor M1 is turned on, the high level of the second nodeN2 is transmitted to the fourth node N4, the third transistor M3 isturned off, the first node N1 is maintained at a high level, thesixteenth transistor M16 is turned off, the third node N3 is maintainedat a low level, the fifth node N5 is maintained at a low level, thefourth transistor M4 is turned on, and the fourth voltage signal VGH2 istransmitted to the output terminal; and the output signal OUT is at ahigh level.

In a T2 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a high level, the second clock signal (theXCK signal) is at a low level, the fifth transistor M5 is turned off,the ninth transistor M9 is turned off, the sixth node N6 is maintainedat a high level, the sixth transistor M6 is turned on, the eighthtransistor M8 is turned off, the eighth node N8 is maintained at a lowlevel, the tenth transistor M10 is turned on, and the second clocksignal (the XCK signal) is transmitted to the seventh node N7, so thatthe seventh node N7 is at a low level, the eleventh transistor M11 isturned on, and the signal of the seventh node N7 is transmitted to thesecond node N2; the second node N2 is at a low level, the fifteenthtransistor M15 is turned on, and the second voltage signal VGH1 istransmitted to the third node N3; the third node N3 is at a high level,the fifth node N5 is at a high level, the fourth transistor M4 is turnedoff, and the low level of the second node N2 turns on the firsttransistor M1; the fourth node N4 is at a low level, the thirdtransistor M3 is turned on, and the third voltage signal VGL2 istransmitted to the output terminal; and the output signal OUT is at alow level.

In a T3 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a low level, the second clock signal (theXCK signal) is at a high level, the fifth transistor M5 is turned on,and the input signal IN is transmitted to the sixth node N6, so that thesixth node N6 is at a high level, the ninth transistor M9 is turned on,and the first voltage signal VGL1 is transmitted to the eighth node N8;the eighth node N8 is at a low level, the tenth transistor M10 is turnedon, the second clock signal (the XCK signal) is transmitted to theseventh node N7, the seventh node N7 is maintained at a high level, thesixth transistor M6 is turned off, the eleventh transistor M11 is turnedoff, the twelfth transistor M12 is turned off, the fifteenth transistorM15 is turned off, the first node N1 is maintained at a high level, thesixteenth transistor M16 is turned off, the third node N3 is maintainedat a high level, the fifth node N5 is maintained at a high level, thefourth transistor M4 is turned off, and the second node N2 is maintainedat a low level. Since the first output control signal CRL and the signalof the preset node (the second node N2) are both low level signals, thefirst transistor M1 is turned off, the fourth node N4 becomes a lowlevel with a lower voltage value under the action of the first outputcontrol signal CRL, the third transistor M3 is kept on, and the thirdvoltage signal VGL2 is transmitted to the output terminal; and theoutput signal OUT is at a low level.

In a T4 stage, the input signal IN is at a high level, the first clocksignal (the CK signal) is at a high level, the second clock signal (theXCK signal) is at a low level, the fifth transistor M5 is turned off,the ninth transistor M9 is turned off, the sixth node N6 is maintainedat a high level, the sixth transistor M6 is turned on, the eighthtransistor M8 is turned off, the eighth node N8 is maintained at a lowlevel, the tenth transistor M10 is turned on, and the second clocksignal (the XCK signal) is transmitted to the seventh node N7, so thatthe seventh node N7 is at a low level, the eleventh transistor M11 isturned on, and the signal of the seventh node N7 is transmitted to thesecond node N2; the second node N2 is at a low level, the fifteenthtransistor M15 is turned on, and the second voltage signal VGH1 istransmitted to the third node N3; the third node N3 is at a high level,the fifth node N5 is at a high level, the fourth transistor M4 is turnedoff, the first transistor M1 is turned off, the fourth node N4 ismaintained at a low level with a lower voltage value, the thirdtransistor M3 is turned on, and the third voltage signal VGL2 istransmitted to the output terminal; and the output signal OUT is at alow level.

In a T5 stage, the input signal IN is at a low level, the first clocksignal (the CK signal) is at a low level, the second clock signal (theXCK signal) is at a high level, the fifth transistor M5 is turned on,and the input signal IN is transmitted to the sixth node N6, so that thesixth node N6 is at a low level, the ninth transistor M9 is turned on,and the first voltage signal VGL1 is transmitted to the eighth node N8;the eighth node N8 is at a low level, the tenth transistor M10 is turnedon, and the second clock signal (the XCK signal) is transmitted to theseventh node N7; the seventh node N7 is maintained at a high level, thesixth transistor M6 is turned off, the eleventh transistor M11 is turnedoff, the sixth node N6 controls the twelfth transistor M12 to be turnedon, and the second voltage signal VGH1 is transmitted to the second nodeN2; the second node N2 is at a high level, the fifteenth transistor M15is turned off, the first transistor M1 is turned on, and the high levelof the second node N2 is transmitted to the fourth node N4; the thirdtransistor M3 is turned off, the fourteenth transistor M14 is turned on,the signal of the sixth node N6 is transmitted to the first node N1, thefirst node N1 is at a low level, the first node N1 controls thesixteenth transistor M16 to be turned on, and the first voltage signalVGL1 is transmitted to the third node N3; the third node N3 is at a lowlevel, the fifth node N5 is at a low level, the fourth transistor M4 isturned on, and the fourth voltage signal VGH2 is transmitted to theoutput terminal; and the output signal OUT is at a high level.

With continued reference to FIG. 27 , it is to be noted that the fourthnode N4 and the preset node (the second node N2) are both low levelsignals in the T2 to T4 stages, and at the junction of the T2 stage andthe T3 stage, the first output control signal CRL transits from a highlevel signal to a low level signal, and the fourth node N4 transits froma low level signal to a low level signal with a lower voltage valuethrough the coupling effect of the first capacitor C1, so that the thirdtransistor M3 can be turned on more fully, and thus tailing can beavoided. It is also to be noted that in the T3 to T4 stages, when thesignal of the preset node (the second node N2) and the first outputcontrol signal CRL are both low level signals, the fifth voltage signalVGL3 controls the first transistor M1 to be turned off. In this manner,the signal change of the fourth node N4 can be prevented from returningto the preset node, to prevent the signal change of the fourth node N4from causing the signal change of the preset node. The signal of thethird node N3 is the input of the shift register at the next stage. Inthis manner, the output of the shift register at the next stage can beprevented from being affected.

With continued reference to FIGS. 23 and 26 , the operating timingsequence of the shift register shown in FIG. 23 is similar to theoperating timing sequence of the shift register shown in FIG. 22 . Thedifference is that in the T2 to T4 stages, the preset node (the secondnode N2) is a low level signal, the second transistor M2 is turned on,and the first output control signal CRL may act on the fourth node N4through the first capacitor C1; and in the T1 and T5 stages, the presetnode (the second node N2) is a low level signal, the second transistorM2 is turned off, and the first output control signal CRL cannot betransmitted to the first capacitor C1. In this manner, it can be ensuredthat only when the preset node (the second node N2) is a low levelsignal, the first output control signal CRL is connected to the shiftregister at this stage, and the first output control signal CRL is notallowed to affect the potential of the fourth node N4 at other times. Inthis manner, it can be ensured that the circuit is more stable when thepreset node (the second node N2) is a high level signal.

It is to be noted that, in the preceding implementations, the firstclock signal in the shift register at the M1-th stage is the CK signal,and the second clock signal is the XCK signal; the first clock signal inthe shift register at the (M1+1)-th stage is the XCK signal, and thesecond clock signal is the CK signal; and the first clock signal and thesecond clock signal in other shift register are set in such alternantmanner. As shown in FIG. 26 , in the case of |M1−M2|=1, that is, M2 isthe next stage or the previous stage of M1. Herein, the case where M2 isthe next stage of M1 is used as an example. After the IN signal in theshift register at the M1-th stage becomes a low level, when the firstclock signal (the CK signal) becomes a low level pulse, the outputsignal OUT becomes a low level signal; and thereafter, when the firstclock signal (the XCK signal) in the shift register at the M2-th stagebecomes a low level signal, the output signal OUT of the shift registerat the M2-th stage becomes a low level signal. In this case, the signalof the preset node of the shift register at the M2-th stage also becomesa low level signal, may be used as the first output control signal CRLof the shift register at the M1-th stage, and is used to pull down thepotential of the fourth node N4.

In addition, it is to be noted that, as described above, since theeffective pulse time of the CK signal and the effective pulse time ofthe XCK signal do not overlap, and to fully simplify the process, thewaveform of the CK signal is often the same as the waveform of the XCKsignal, and the difference only exists in the timing. In this case, wheneach of the CK signal and the XCK signal transits once, the outputsignal of the shift register is shifted twice toward the next stage andthe stage next to the next stage. In conjunction with the precedinganalysis, when the pulse period of the first clock signal (the CK signalor the XCK signal) is S1, the width of the low level pulse of the outputsignal OUT is S2, where S2=a×S1. Since when the first clock signalpasses through one pulse period, each of the CK signal and the XCKsignal transits once, then in the case of i≤2a, during at least part ofthe time period where the shift register at the M1-th stage outputs alow level output signal OUT, the signal of the preset node of the shiftregister at the M2-th stage may be a low level signal and may be used asthe first output control signal received by the shift register at theM1-th stage, so that the potential of the fourth node N4 can be pulleddown, and the stable output of the low level output signal OUT can beensured.

In an embodiment, in the N stages of shift registers of the drivercircuit 10, the output signal of the shift register at the M3-th stageis not used as the drive signal of the display region AA of the displaypanel, and the output signal of the shift register at the remaining atleast one stage is used as the drive signal of the display region AA ofthe display panel, where 1≤M3≤N.

In an embodiment, the output signal of the shift register at the M3-thstage is not used as a drive signal of the display region AA, and theshift register at the M3-th stage is a virtual shift register. In thedriver circuit 10, the first output control signal CRL of the shiftregister at one stage is the signal of the preset node NY of the shiftregister at another stage. Therefore, the shift register that is used asa virtual shift register needs to be provided in the driver circuit 10.The function of the virtual shift register is to provide the firstoutput control signal CRL for the shift registers at other stages, andthe first output control signal CRL is not used as a drive signal of thedisplay region AA of the display panel. For example, in one embodiment,the first output control signal CRL of the shift register at theprevious stage is the signal of the preset node NY of the shift registerat the next stage, and then a shift register at one stage needs to beused as a virtual shift register to serve as the shift register at theprevious stage to provide the first output control signal CRL. In thiscase, M3 may be equal to N, that is, the shift register at the laststage is used as the virtual shift register.

Based on the preceding inventive concept, embodiments of the presentdisclosure further provide a display device. The display device includesthe display panel described in any embodiment of the present disclosure.Therefore, the display device provided in embodiments of the presentdisclosure also has the beneficial effects described in the precedingembodiments, which will not be repeated herein.

For example, FIG. 28 is a structure diagram of a display deviceaccording to an embodiment of the present disclosure. Referring to FIG.28 , the display device includes the display panel P provided in thepreceding embodiments. For example, the display device may include amobile phone, a computer, a smart wearable device and the like, which isnot limited in embodiments of the present disclosure.

What is claimed is:
 1. A display panel, comprising: a driver circuitcomprising N stages of cascaded shift registers, wherein N≥2, and eachof the N stages of cascaded shift registers comprises: a first controlpart and a second control part; wherein the first control part isconfigured to receive at least an input signal and controls a signal ofa first node and a signal of a second node in response to at least afirst clock signal, and the first control part is configured to receivea first voltage signal and a second voltage signal and controls a signalof a third node in response to a signal of the first node and a signalof the second node, wherein the first voltage signal is a low levelsignal, and the second voltage signal is a high level signal; and thesecond control part comprises a first control unit and a second controlunit; the first control unit is configured to receive a signal of apreset node and a first output control signal and control a signal of afourth node, wherein the preset node is one of the second node or thethird node; and the second control unit is configured to receive a thirdvoltage signal and generate an output signal in response to a signal ofthe fourth node, or the second control unit is configured to receive afourth voltage signal and generate an output signal in response to asignal of a fifth node, wherein the fifth node, the second node and thethird node are three independent nodes, the fifth node is directlyelectrically connected to one of the second node or the third node thatis not the preset node, the third voltage signal is a low level signal,and the fourth voltage signal is a high level signal; a first outputcontrol signal received by a shift register at an M1-th stage is asignal of the preset node of a shift register at an M2-th stage, wherein1≤M1≤N, 1≤M2≤N, 1≤|M1−M2|≤i, and 2≤i≤N−1.
 2. The display panel of claim1, wherein during at least part of a time period during which a signalof the fourth node is a low level signal, each of a signal of the presetnode and the first output control signal is a low level signal.
 3. Thedisplay panel of claim 1, wherein a pulse period of the first clocksignal is S1, and a width of a low level pulse of the output signal isS2, wherein S2=a×S1, and i≤2a.
 4. The display panel of claim 1, whereinthe first control unit comprises a first capacitor, wherein a firstelectrode plate of the first capacitor is configured to receive thefirst output control signal, and a second electrode plate of the firstcapacitor is connected to the fourth node.
 5. The display panel of claim4, wherein the first control unit further comprises a first gating unit,wherein one terminal of the first gating unit is connected to the presetnode, another terminal of the first gating unit is connected to thefourth node, and a control terminal of the first gating unit isconfigured to receive a fifth voltage signal; and in a case where eachof a signal of the preset node and the first output control signal is alow level signal, the fifth voltage signal is configured to control thefirst gating unit to be turned off.
 6. The display panel of claim 5,wherein the first gating unit comprises a first transistor, wherein asource of the first transistor is connected to the preset node, a drainof the first transistor is connected to the fourth node, and a gate ofthe first transistor is configured to receive the fifth voltage signal;and in a case where each of a signal of the preset node and the firstoutput control signal is a low level signal, the fifth voltage signal isconfigured to control the first transistor to be turned off.
 7. Thedisplay panel of claim 6, wherein the first transistor is a P-type metaloxide semiconductor (PMOS) type transistor, the fifth voltage signal isa constant low level signal V, and |V|≤|VGL1|+|Vth|, wherein VGL1denotes the first voltage signal, and Vth denotes a threshold voltage ofthe first transistor.
 8. The display panel of claim 6, wherein the fifthvoltage signal and the first voltage signal are a same signal.
 9. Thedisplay panel of claim 4, wherein the first control unit furthercomprises a second gating unit, wherein one terminal of the secondgating unit is connected to the fourth node, another terminal of thesecond gating unit is configured to receive the first output controlsignal, and a control terminal of the second gating unit is connected tothe preset node; and in a case where a signal of the preset node is alow level signal, the second gating unit is turned on.
 10. The displaypanel of claim 9, wherein the second gating unit comprises a secondtransistor, wherein a source of the second transistor is configured toreceive the first output control signal, a drain of the secondtransistor is connected to the fourth node, and a gate of the secondtransistor is connected to the preset node.
 11. The display panel ofclaim 1, wherein in a case where the preset node is the third node andthe input signal of each of the N stages of cascaded shift registers isa low level signal, the output signal is a low level signal.
 12. Thedisplay panel of claim 1, wherein in a case where the preset node is thesecond node and the input signal of each of the N stages of cascadedshift registers is a high level signal, the output signal is a low levelsignal.
 13. The display panel of claim 1, wherein in the N stages ofcascaded shift registers of the driver circuit, a signal of the thirdnode of the shift register at the M1-th stage is connected to an inputsignal terminal of a shift register at an (M1+1)-th stage and is used asan input signal of the shift register at the (M1+1)-th stage, wherein1≤M1≤N.
 14. The display panel of claim 1, wherein the second controlunit comprises a third transistor and a fourth transistor; a source ofthe third transistor is configured to receive the third voltage signal,a drain of the third transistor is connected to an output signalterminal, and a gate of the third transistor is connected to the fourthnode; and a source of the fourth transistor is configured to receive thefourth voltage signal, a drain of the fourth transistor is connected tothe output signal terminal, and a gate of the fourth transistor isconnected to the fifth node.
 15. The display panel of claim 1, whereinthe first control part comprises a third control unit, a fourth controlunit, and a fifth control unit; the third control unit is configured toreceive the input signal and control a signal of a sixth node inresponse to the first clock signal, wherein the sixth node is connectedto the first node; the fourth control unit is configured to receive thesecond voltage signal and control a signal of the second node inresponse to at least the input signal and a signal of the sixth node;and the fifth control unit is configured to receive the first voltagesignal and the second voltage signal and control a signal of the thirdnode in response to a signal of the first node and a signal of thesecond node.
 16. The display panel of claim 1, wherein an effectivepulse time of a first clock signal received by the shift register at theM1-th stage and an effective pulse time of a first clock signal receivedby a shift register at an (M1+1)-th stage do not overlap.
 17. Thedisplay panel of claim 1, wherein the first control part comprises athird control unit, a fourth control unit, and a fifth control unit; thethird control unit is configured to receive the input signal and controla signal of a sixth node in response to the first clock signal, whereinthe sixth node is connected to the first node; the fourth control unitis configured to receive the first voltage signal and the second voltagesignal and control a signal of the second node in response to a signalof the sixth node, the first clock signal, and a second clock signal;and the fifth control unit is configured to receive the first voltagesignal and the second voltage signal and control a signal of the thirdnode in response to a signal of the first node and a signal of thesecond node.
 18. The display panel of claim 1, wherein in the N stagesof cascaded shift registers of the driver circuit, an output signal of ashift register at an M3-th stage is not used as a drive signal of adisplay region of the display panel, and an output signal of a shiftregister at remaining at least one stage is used as the drive signal ofthe display region of the display panel, wherein 1≤M3≤N.
 19. A displaydevice, comprising a display panel, wherein the display panel comprises:a driver circuit comprising N stages of cascaded shift registers,wherein N≥2, and each of the N stages of cascaded shift registerscomprises: a first control part and a second control part; wherein thefirst control part is configured to receive at least an input signal andcontrols a signal of a first node and a signal of a second node inresponse to at least a first clock signal, and the first control part isconfigured to receive a first voltage signal and a second voltage signaland controls a signal of a third node in response to a signal of thefirst node and a signal of the second node, wherein the first voltagesignal is a low level signal, and the second voltage signal is a highlevel signal; and the second control part comprises a first control unitand a second control unit; the first control unit is configured toreceive a signal of a preset node and a first output control signal andcontrol a signal of a fourth node, wherein the preset node is one of thesecond node or the third node; and the second control unit is configuredto receive a third voltage signal and generate an output signal inresponse to a signal of the fourth node, or the second control unit isconfigured to receive a fourth voltage signal and generate an outputsignal in response to a signal of a fifth node, wherein the fifth node,the second node and the third node are three independent nodes, thefifth node is directly electrically connected to one of the second nodeor the third node that is not the preset node, the third voltage signalis a low level signal, and the fourth voltage signal is a high levelsignal; a first output control signal received by a shift register at anM1-th stage is a signal of the preset node of a shift register at anM2-th stage, wherein 1≤M1≤N, 1≤M2≤N, 1≤|M1−M2|≤i, and 2≤i≤N−1.